clutch

I have a 2000 Honda Accord with 2.2 vtec engine (f23a1). A couple days ago, my clutch started getting stuck to the floor. I can still shift between gears if I hold it in Neutral and pop the clutch back up with my foot. It does it the worst in 1st to 2nd and in reverse.. and sometimes at a stop light (if I dont put it in neutral), it seems as if the clutch is not fully disengaged. It feels as if there is a bubble in the line, but I have bled the system entirely 2 times now.. both with help from a friend and using gravity alone. The fluid is extra clean now.. lol. Anyway, would this be a problem with the slave cylinder or the master cylinder?? and how would I know which to replace?? There is no fluid leaking from either components.. Please help me...